Multiple-Application Trapezoidal Rule

Implementation based on the theory presented in "Numerical Methods for Engineers" by Steven C. Chapra

Instructions to use the function:

The user must provide the function as an anonymous function in the command window. This can be done by introducing

f=@(x) x.*exp(2*x)

Then, the user should invoke the function by indicating four parameters:

Trap(f,lmin,lmax,N)

where f is the integrand and N is the number of intervals. lmin and lmax are the lower and upper limits of the definitive integrand. In addition, a figure is depicted showing the evaluation points and an approximated integration region.